Silverlight的几个知识点(二)

1,Silverlight 与JS交互：

<1>, silverlight 调用js：

HtmlPage.Window.Invoke("函数名", new object[] { 参数数组});

HtmlPage.Window.CreateInstance("函数名", new object[] { 参数数组});

<2>,JS 调用silverlight方法：

HtmlPage.RegisterScriptableObject("RPFrame", this);// 1，注册 [ScriptableMember] // 2,标记 public DateTime GetDataFrom() { return Utility.StartTime; } function pluginLoaded(sender, args) { // 3,JS调用 slPlugin = sender.getHost(); __dtFrom = slPlugin.content.RPFrame.GetDataFrom(); }

2，silverlight hitTest

3, Control 控件Click 事件模拟

protected event RoutedEventHandler Click; void RotationPlanningSlot_MouseLeftButtonUp(object sender, MouseButtonEventArgs e) { if (Click != null && e.GetPosition(thisElement.Parent as UIElement) == beginMousePosition) // Add click envent { Click(this, e); } }

4,Silverlight 3的打印，

[ScriptableMember] public void GetPrintPNG() { WriteableBitmap bitmap = new WriteableBitmap(this.MainPlaningCanvas,new TranslateTransform()); EditableImage imageData = new EditableImage(bitmap.PixelWidth, bitmap.PixelHeight); for (int y = 0; y < bitmap.PixelHeight; ++y) { for (int x = 0; x < bitmap.PixelWidth; ++x) { int pixel = bitmap.Pixels[bitmap.PixelWidth * y + x]; imageData.SetPixel(x, y, (byte)((pixel >> 16) & 0xFF), (byte)((pixel >> 8) & 0xFF), (byte)(pixel & 0xFF), (byte)((pixel >> 24) & 0xFF) ); } } Stream pngStream = imageData.GetStream(); byte[] binaryData = new Byte[pngStream.Length]; long bytesRead = pngStream.Read(binaryData, 0, (int)pngStream.Length); string base64String = System.Convert.ToBase64String(binaryData, 0, binaryData.Length); // save the encoded PNG bytes to the page HtmlDocument document = HtmlPage.Document; HtmlElement txtPNGBytes = document.GetElementById("txtPNGBytes"); txtPNGBytes.SetProperty("value", base64String); // this calls the js function "postBackPrint" which will cause a postback //HtmlPage.Window.CreateInstance("postBackPrint", new string[] { }); }

PngEncoder.cs

using System; using System.Windows; using System.Windows.Controls; using System.Windows.Documents; using System.Windows.Ink; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Animation; using System.Windows.Shapes; using System.IO; using System.Windows.Browser; using System.Reflection; namespace PlanningCtrl.UI { public class PngEncoder { private const int _ADLER32_BASE = 65521; private const int _MAXBLOCK = 0xFFFF; private static byte[] _HEADER = { 0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A }; private static byte[] _IHDR = { (byte)'I', (byte)'H', (byte)'D', (byte)'R' }; private static byte[] _GAMA = { (byte)'g', (byte)'A', (byte)'M', (byte)'A' }; private static byte[] _IDAT = { (byte)'I', (byte)'D', (byte)'A', (byte)'T' }; private static byte[] _IEND = { (byte)'I', (byte)'E', (byte)'N', (byte)'D' }; private static byte[] _4BYTEDATA = { 0, 0, 0, 0 }; private static byte[] _ARGB = { 0, 0, 0, 0, 0, 0, 0, 0, 8, 6, 0, 0, 0 }; public static Stream Encode(byte[] data, int width, int height) { MemoryStream ms = new MemoryStream(); byte[] size; // Write PNG header ms.Write(_HEADER, 0, _HEADER.Length); // Write IHDR // Width: 4 bytes // Height: 4 bytes // Bit depth: 1 byte // Color type: 1 byte // Compression method: 1 byte // Filter method: 1 byte // Interlace method: 1 byte size = BitConverter.GetBytes(width); _ARGB[0] = size[3]; _ARGB[1] = size[2]; _ARGB[2] = size[1]; _ARGB[3] = size[0]; size = BitConverter.GetBytes(height); _ARGB[4] = size[3]; _ARGB[5] = size[2]; _ARGB[6] = size[1]; _ARGB[7] = size[0]; // Write IHDR chunk WriteChunk(ms, _IHDR, _ARGB); // Set gamma = 1 size = BitConverter.GetBytes(1 * 100000); _4BYTEDATA[0] = size[3]; _4BYTEDATA[1] = size[2]; _4BYTEDATA[2] = size[1]; _4BYTEDATA[3] = size[0]; // Write gAMA chunk WriteChunk(ms, _GAMA, _4BYTEDATA); // Write IDAT chunk uint widthLength = (uint)(width*4)+1; uint dcSize = widthLength * (uint)height; // First part of ZLIB header is 78 1101 1010 (DA) 0000 00001 (01) // ZLIB info // // CMF Byte: 78 // CINFO = 7 (32K window size) // CM = 8 = (deflate compression) // FLG Byte: DA // FLEVEL = 3 (bits 6 and 7 - ignored but signifies max compression) // FDICT = 0 (bit 5, 0 - no preset dictionary) // FCHCK = 26 (bits 0-4 - ensure CMF*256+FLG / 31 has no remainder) // Compressed data // FLAGS: 0 or 1 // 00000 00 (no compression) X (X=1 for last block, 0=not the last block) // LEN = length in bytes (equal to ((width*4)+1)*height // NLEN = one's compliment of LEN // Example: 1111 1011 1111 1111 (FB), 0000 0100 0000 0000 (40) // Data for each line: 0 [RGBA] [RGBA] [RGBA] ... // ADLER32 uint adler = ComputeAdler32(data); MemoryStream comp = new MemoryStream(); // Calculate number of 64K blocks uint rowsPerBlock = _MAXBLOCK/widthLength; uint blockSize = rowsPerBlock*widthLength; uint blockCount; ushort length; uint remainder=dcSize; if ((dcSize % blockSize) == 0) { blockCount = dcSize/blockSize; } else { blockCount = (dcSize/blockSize)+1; } // Write headers comp.WriteByte(0x78); comp.WriteByte(0xDA); for (uint blocks=0; blocks 0) c = 0xEDB88320 ^ (c >> 1); else c = c >> 1; } _crcTable[n] = c; } _crcTableComputed = true; } private static uint UpdateCRC(uint crc, byte[] buf, int len) { uint c = crc; if (!_crcTableComputed) { MakeCRCTable(); } for (int n = 0; n < len; n++) { c = _crcTable[(c ^ buf[n]) & 0xFF] ^ (c >> 8); } return c; } /* Return the CRC of the bytes buf[0..len-1]. */ private static uint GetCRC(byte[] buf) { return UpdateCRC(0xFFFFFFFF, buf, buf.Length) ^ 0xFFFFFFFF; } private static uint ComputeAdler32(byte[] buf) { uint s1 = 1; uint s2 = 0; int length=buf.Length; for (int idx=0; idx

EditableImage.cs

using System; using System.Windows; using System.Windows.Controls; using System.Windows.Documents; using System.Windows.Ink; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Animation; using System.Windows.Shapes; using System.IO; namespace PlanningCtrl.UI { public class EditableImage { private int _width=0; private int _height=0; private bool _init=false; private byte[] _buffer; private int _rowLength; public event EventHandler ImageError; public EditableImage(int width, int height) { this.Width = width; this.Height = height; } public int Width { get { return _width; } set { if (_init) { OnImageError("Error: Cannot change Width after the EditableImage has been initialized"); } else if ((value <= 0) || (value > 4047)) { OnImageError("Error: Width must be between 0 and 2047"); } else { _width = value; } } } public int Height { get { return _height; } set { if (_init) { OnImageError("Error: Cannot change Height after the EditableImage has been initialized"); } else if ((value <= 0) || (value > 2047)) { OnImageError("Error: Height must be between 0 and 2047"); } else { _height = value; } } } public void SetPixel(int col, int row, Color color) { SetPixel(col, row, color.R, color.G, color.B, color.A); } public void SetPixel(int col, int row, byte red, byte green, byte blue, byte alpha) { if (!_init) { _rowLength = _width*4 + 1; _buffer = new byte[_rowLength *_height]; // Initialize for (int idx=0; idx<_height; idx++) { _buffer[idx*_rowLength] = 0; // Filter bit } _init = true; } if ((col > _width) || (col < 0)) { OnImageError("Error: Column must be greater than 0 and less than the Width"); } else if ((row > _height) || (row < 0)) { OnImageError("Error: Row must be greater than 0 and less than the Height"); } // Set the pixel int start = _rowLength*row + col*4 + 1; _buffer[start] = red; _buffer[start + 1] = green; _buffer[start + 2] = blue; _buffer[start + 3] = alpha; } public Color GetPixel(int col, int row) { if ((col > _width) || (col < 0)) { OnImageError("Error: Column must be greater than 0 and less than the Width"); } else if ((row > _height) || (row < 0)) { OnImageError("Error: Row must be greater than 0 and less than the Height"); } Color color = new Color(); int _base = _rowLength * row + col + 1; color.R = _buffer[_base]; color.G = _buffer[_base + 1]; color.B = _buffer[_base + 2]; color.A = _buffer[_base + 3]; return color; } public Stream GetStream() { Stream stream; if (!_init) { OnImageError("Error: Image has not been initialized"); stream = null; } else { stream = PngEncoder.Encode(_buffer, _width, _height); } return stream; } private void OnImageError(string msg) { if (null != ImageError) { EditableImageErrorEventArgs args = new EditableImageErrorEventArgs(); args.ErrorMessage = msg; ImageError(this, args); } } public class EditableImageErrorEventArgs : EventArgs { private string _errorMessage=string.Empty; public string ErrorMessage { get { return _errorMessage; } set { _errorMessage = value; } } } } }

5，为ScrollViewer增加MouseWheel 支持

void MainScroll_MouseWheel(object sender, MouseWheelEventArgs e) { ScrollViewer viewer = sender as ScrollViewer; if (!e.Handled) { double offsite = viewer.VerticalOffset - e.Delta; viewer.ScrollToVerticalOffset(offsite); e.Handled = true; } }

6,ToolTip设计

7，自定义的MessageBox

详见：http://www.cnblogs.com/hedonister/archive/2009/08/02/1537142.html

8,定义Control的热区

protected void SetHotAreaCursor(FrameworkElement targetElement, double xOffsiteElment) { // Set the hot area if (xOffsiteElment > this.Width * 0.03 && xOffsiteElment < this.Width * 0.97) { targetElement.Cursor = Cursors.Hand; } else { targetElement.Cursor = Cursors.SizeWE; } }

9，child Window和父窗口传值

public partial class testChildWindow : ChildWindow { public string testString { get; set; } public testChildWindow() { InitializeComponent(); } private void OKButton_Click(object sender, RoutedEventArgs e) { testString = DateTime.Now.ToString(); this.DialogResult = true; } private void CancelButton_Click(object sender, RoutedEventArgs e) { this.DialogResult = false; } } testChildWindow tc = new testChildWindow(); //实例化弹出窗口 public SilverlightControl1() { InitializeComponent(); tc.Closed += new EventHandler(tc_Closed); //弹出窗口的关闭事件 this.Loaded += new RoutedEventHandler(SilverlightControl1_Loaded); } void SilverlightControl1_Loaded(object sender, RoutedEventArgs e) { tc.Show(); //弹出窗口 } void tc_Closed(object sender, EventArgs e) { string val = tc.testString;//返回的值 }